"Tubes are most efficient transport options. Grow a moustache and jump into a pipe today!"
Tube Travels are the 10th Land Industry. They only require 100 B Airports to unlock but a x524,288 crit power may be required to afford them easily. Also, the ridiculously high generator cost of 100 BB Airports may force those without a level 3 Mega Tron to skip the first tube travel mission at Rank 87.
Jimmy Astroseed automates this industry and is unlocked at Rank 88.
Tube Travels are also featured as the 5th tier in the Brain Industry during the State Science event.